Making my domain name point to my wordpress blog

I had my current DNS registrar change the name servers to NS WordPress 1, 2 and 3 s I was told to. I hve tried twice to purchase the upgrade to map the domain to this name, but it doesn't seem to take. It was 4 days ago, but when I look at that What's My Dns site, it does show a green light in Seattle nd Paris. I can't get anyone to answer my FOUR emails to wordpress. Can anyone help me?
Thanks,
Julie